With energy costs soaring now is the best time to make your hot tub as energy efficient as possible! This spa cover has three individual layers (Waterproof outer/ Insulation foam, Reflective heat barrier) each with an individual purpose combined to create an efficient thermal cover designed to save you money and protect your hot tub and its cover! We have these available in 3 different sizes and have allowed enough space for them to go over hot tubs with a standard cover lifter on them.